—I didn’t see her yesterday,I looked for her everywhere,but couldn’t find her.

—Oh,but you　　.She was working in the office.

A．must have

B．ought to

C．ought to have

D．can’t have

按现行《清单计价规范》规定，下列不按立方米作为计量单位的桩是（）。

A.砂石桩

B.钢板桩

C.预制钢筋混凝土方桩

D.人工挖孔灌注桩